Hi lam,
The performance of your program will increase if you limit what is performed inside the while loop. I took a look at your origninal VI, as well as the modified version, which you edited in light of Micaela's comments in the previous post. A couple additional modifications I would recommend: Bring the trigger configuration outside the while loop so it is only performed once. Also make sure that you re-start your task if you choose to stop it in each iteration of the loop. I would also suggest removing the framed sequence structures, as they are not necessary in this code. If you need to govern dataflow, you can do that using the error wire between VI's. Most of this code can be run simultaneously however. The sequence structures make your program wait for certain events to complete inside the while loop.
Give that a try and let me know if you still have questions!
Regards,
Nicholas B, National Instruments
